Portable antioffset device



' J. R. BLAINE PQRTABLE AN'I'IOFFSJET DEVICE Filed'March 28. 1921 UHTare

JOSEPH R. BLAINE, OF OAK PARK, ILLINOIS, ASSIGNOR 'I'O MIEHLE PRINTINGPRESS & MG. (10., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PORTABLE ANTIOFFSET DEVICE.

Application filed March 28, 1921. Serial No. 456,258.

To all whom it may concern.

Be it known that I, JOSEPH R. BLAINE, a citizen of the United States,residing at Oak Park, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Portable AntiofisetDevices, of which the following is a specification.

My invention relates to printing presses I1) and particularly to ananti-offsetting device for use in connection therewith.

It is a well-recognized fact in the printing art that the ink which isimpressed on sheets of paper in printing presses does not havesuiiicient time to dry between the time the impression is made and thetime the sheet is delivered to the pile. When printing is being done onglazed paper the ink requires a longer time to dry because of the factthat the paper absorbs the ink less rapidly than when unglazed.Consequently, when printing on glazed paper it is necessary to insertslip sheets between adjacent sheets to prevent ofi'setting. Thisrequires slip sheets but the time of operators to insert the sheetsbetween the printed sheets.

One of the objects of my invention is to provide an anti-offset devicewhich will 39 eliminate ofi'setting and avoid the use of slip sheets.Another object of my invention is to provide an anti-oflset device whichis readily portable and may be app-lied to several printing presses atthe same time.

A further object is to provide an antiofisetting device which will besimple to connect and operate.

A still further object is to provide an anti-ofl'set device in aportable form so that the same may be moved from one printing press toanother, or brought into position to serve several presses at the sametime to efiectively prevent ofisetting.

A still further object is to improve antiofisetting devices forsuccessful commercial use in connection with printing presses.

In carrying out my invention 1 have shown in somewhat diagrammatic formthe essential features thereof.

In Figure 1, I have shown the preferred form of my invention.

Figure 2 is a top plan view of a portion of the apparatus shown inFigure 1; and,

Figure 3 is a sectional view through the not only the paper necessary tomake theporta-ble container of Figure 1 showing the same and means forcreating the high frequency current in a diagrammatic form.

Carrying out my invention I utilize the well-known corona dischargeplaced in close proximity to the printed sheet and provide means inportable form for creating radio frequency current necessary to make thecorona dischargef In the drawings, 5 represents a printed sheet beingcarried on the conveyor tapes 6 suitably mounted on rollers 7 and 8 of aprinting press of any usual type. Sheet 5, it is understood, is beingconveyed from the printing rolls to the pile table. Mounted above thesheet 5 is a board 9 carrying'conductors having overlapping portions forthe purpose of permitting a corona discharge, the conductors being ar--ranged as shown in Figure 2, in which each end of the conductorsterminates in binding posts 10 and 11, for connection by wires 12 and13,with a source of radio frequency current. It is a well recognized factthat the present type of high potential current installation used forthe purpose of remov- 80 ing static electricity from printing paper isvery dangerous, often times resulting in disastrous injuries tooperators where such lnstallations are being used. Furthermore,

it is a well-recognized fact that radio he quency electricity can beconveyed only a limited distance as it is dissipated in the air andbecomes ineffective. It is also a wellrecognized. fact that theinstallation necessary' to supply raolio'frequencyv electricity for anumber of printing presses would be costly.

In carrying out my invention, to overcome the hereinbefore recitedobjections and to provide improved means for anti-offsetting, I providea portable container 14 carried by a vehicle or truck 14* suitablmounted on rollers 15 or equipped wit suitable means to render itportable for movement about the printing shop as desired. Within thecontainer 14 is mounted suitable means for furnishing a radio frequencycurrent. Connection 16 adapted for insertion in an ordinary electriclight socket, furnishes the source of ener to the transformer A which isin the true 14. Leading from the secondary portion of the transformerare the wires 17 and 18 having a spark gap 19 interposed therebetween;

Each ofthe wires 17 and 18 terminates in a condenser, the leads of whichare connected to a Teslaf coil '20, and from which coil conductors 12and 13 extend for connection to the binding posts and 11, on the board9. If desired more than a single pair of conductors 12 and 13 may be ledfrom the :lesla coil 20 to serve more than one printmg .press. Where thepresses are arranged in battery form, it is possible to move thecontainer 14 between adjacent presses and connect each press withthesource of radio quenc current therein. It will be observed t at bymounting the radio frequency generating apparatus in a portablecontainer it is possible tomove the same about the shop at will, and tomake-the conductors which convey the radio fre quency current as shortas is consistent with the installation of the same, so that. the loss ofradio frequency current is reduced to a Furthermore, the use of myapparatus removes any chance for injury to the operators. It is possibleto grasp the conductors l2 and 13 with the .bare hand without feelingany electrical efi'ectwhatsoever except warmth. The 0 .ration of thecorona dischar e is observe at. the terminals of the con uctors' 12 and13, which,

of course, are insulated wires, as well as at the antennae. It is thecorona discharge.-

that makes the ozone for ogridizing the ink on the newly printed, sheet5 as the same is being conveyed from the rolls to the pile table. Ifdesired, by increasing the efficiency of the radio frequency currentgenerating system, as many pairs of conductors as'desired may be ledfrom the truck 14.-

Itis a well recognized fact that it is' not always necessary to providemeans for antiofisetting the sheets being printed as weather conditionscontrol to some extent, as does radio frequency current, a portablesupport for said last-named means, and means for detachably connectingsaid radio frequency current. generating means with said ozonegenerating means.

2. The combination. with paper handling mechanism, of means forgenerating ozone, said means being supported ad'acent the path of thepaper handled by t e mechanism, and means for generating radio frequencyc'urrent associated with said ozone generating means.

'3. The-combination with paper handling mechanism, of means for generatmozone, said means comprising a p uralitg o spaced electrodes located ina plane, sai electrodes being placed parallel'to and adjacent the.

path of the paper handled by the mechanism, and means for generatingradio fre-.

quency current associated with said ozone generating means.

Sliged at Chicago, lllmois, this 25th day of rch, 1921.

' JOSEPH R. BLAH-E.

